Photis longicaudata
- Group
- Crustaceans
- Records since 2000
- 4,033
- Peak month
- September
Red Phalarope
- Group
- Birds
- Records since 2000
- 3,944
- Scientific name
- Phalaropus fulicarius
Rhizocarpon reductum
- Group
- Lichens
- Records since 2000
- 3,863
- Peak month
- September
Knotted Thread Hydroid
- Group
- Jellyfish, corals and anemones
- Records since 2000
- 3,848
- Scientific name
- Obelia geniculata
Lumbrineris cingulata
- Group
- Worms (annelids)
- Records since 2000
- 3,841
- Peak month
- September
Common Spangle Gall
- Group
- Bees, wasps and ants
- Records since 2000
- 3,837
- Scientific name
- Neuroterus quercusbaccarum
Ampelisca brevicornis
- Group
- Crustaceans
- Records since 2000
- 3,740
- Peak month
- September
Pale Glaucous Thread-moss
- Group
- Mosses
- Records since 2000
- 3,715
- Scientific name
- Pohlia wahlenbergii
Native Oyster
- Group
- Molluscs
- Records since 2000
- 3,702
- Scientific name
- Ostrea edulis
Ampelisca diadema
- Group
- Crustaceans
- Records since 2000
- 3,658
- Peak month
- September
Bank Vole
- Group
- Mammals
- Records since 2000
- 3,619
- Scientific name
- Myodes glareolus
Limnephilus flavicornis
- Group
- Caddisflies
- Records since 2000
- 3,589
- Peak month
- September
Saucer Bug
- Group
- True bugs
- Records since 2000
- 3,582
- Scientific name
- Ilyocoris cimicoides
Horse-mussel
- Group
- Molluscs
- Records since 2000
- 3,571
- Scientific name
- Modiolus modiolus
Oarweed
- Group
- Seaweeds and algae
- Records since 2000
- 3,533
- Scientific name
- Laminaria digitata
Crenulated Flapwort
- Group
- Liverworts
- Records since 2000
- 3,513
- Scientific name
- Solenostoma gracillimum
Eurasian Wryneck
- Group
- Birds
- Records since 2000
- 3,488
- Scientific name
- Jynx torquilla
Dulse
- Group
- Seaweeds and algae
- Records since 2000
- 3,467
- Scientific name
- Palmaria palmata
Twospotted goby
- Group
- Fish
- Records since 2000
- 3,339
- Scientific name
- Gobiusculus flavescens
Estuary ragworm
- Group
- Worms (annelids)
- Records since 2000
- 3,299
- Scientific name
- Hediste diversicolor
Montagu's Stellate Barnacle
- Group
- Crustaceans
- Records since 2000
- 3,299
- Scientific name
- Chthamalus montagui
Violet Bramble Rust
- Group
- Fungi
- Records since 2000
- 3,295
- Scientific name
- Phragmidium violaceum
Stink bug
- Group
- True bugs
- Records since 2000
- 3,290
- Scientific name
- Picromerus bidens
Blue-winged Olive
- Group
- Mayflies
- Records since 2000
- 3,275
- Scientific name
- Serratella ignita
Maerl spec.
- Group
- Other plants
- Records since 2000
- 3,180
- Peak month
- September
Water hog lice/slaters
- Group
- Crustaceans
- Records since 2000
- 3,172
- Scientific name
- Asellus aquaticus
Ampelisca typica
- Group
- Crustaceans
- Records since 2000
- 3,168
- Peak month
- September
Brill
- Group
- Fish
- Records since 2000
- 3,146
- Scientific name
- Scophthalmus rhombus
Least skeleton shrimp
- Group
- Crustaceans
- Records since 2000
- 3,129
- Scientific name
- Phtisica marina
Metriocnemus albolineatus
- Group
- True flies
- Records since 2000
- 3,129
- Peak month
- September
Navicula gregaria
- Group
- Seaweeds and algae
- Records since 2000
- 3,118
- Peak month
- September
Water Scorpion, Water bug
- Group
- True bugs
- Records since 2000
- 3,101
- Scientific name
- Nepa cinerea
Brown Shrimp
- Group
- Crustaceans
- Records since 2000
- 3,094
- Scientific name
- Crangon crangon
Sea Oak
- Group
- Seaweeds and algae
- Records since 2000
- 3,085
- Scientific name
- Halidrys siliquosa
Baltic Tellin
- Group
- Molluscs
- Records since 2000
- 3,070
- Scientific name
- Macoma balthica
Durham slug
- Group
- Molluscs
- Records since 2000
- 3,032
- Scientific name
- Arion flagellus
Spiral Wrack
- Group
- Seaweeds and algae
- Records since 2000
- 3,016
- Scientific name
- Fucus spiralis
Rough Periwinkle
- Group
- Molluscs
- Records since 2000
- 2,933
- Scientific name
- Littorina saxatilis
Thick Top Shell
- Group
- Molluscs
- Records since 2000
- 2,926
- Scientific name
- Phorcus lineatus
Gomphonema parvulum
- Group
- Seaweeds and algae
- Records since 2000
- 2,885
- Peak month
- September
Reimeria sinuata
- Group
- Seaweeds and algae
- Records since 2000
- 2,874
- Peak month
- September
Chocolate finger sponge
- Group
- Sponges
- Records since 2000
- 2,863
- Scientific name
- Raspailia ramosa
Common Prawn
- Group
- Crustaceans
- Records since 2000
- 2,854
- Scientific name
- Palaemon serratus
Strict Haircap
- Group
- Mosses
- Records since 2000
- 2,802
- Scientific name
- Polytrichum strictum
Cocconeis placentula
- Group
- Seaweeds and algae
- Records since 2000
- 2,767
- Peak month
- September
Crumb-of-bread sponge
- Group
- Sponges
- Records since 2000
- 2,758
- Scientific name
- Hymeniacidon perlevis
Channelled Wrack
- Group
- Seaweeds and algae
- Records since 2000
- 2,729
- Scientific name
- Pelvetia canaliculata
Buckthorn
- Group
- Flowering plants
- Records since 2000
- 2,696
- Scientific name
- Rhamnus cathartica